{"id":1949,"date":"2017-08-05T13:41:49","date_gmt":"2017-08-05T11:41:49","guid":{"rendered":"http:\/\/blogs.gentoo.org\/ago\/?p=1949"},"modified":"2017-08-18T15:47:40","modified_gmt":"2017-08-18T13:47:40","slug":"graphicsmagick-heap-based-buffer-overflow-in-readsunimage-sun-c","status":"publish","type":"post","link":"https:\/\/blogs.gentoo.org\/ago\/2017\/08\/05\/graphicsmagick-heap-based-buffer-overflow-in-readsunimage-sun-c\/","title":{"rendered":"graphicsmagick: heap-based buffer overflow in ReadSUNImage (sun.c)"},"content":{"rendered":"<p><strong>Description<\/strong>:<br \/>\n<a href=\"http:\/\/www.graphicsmagick.org\/\">graphicsmagick<\/a> is a collection of tools and libraries for many image formats.<\/p>\n<p>The complete ASan output of the issue:<\/p>\n<pre><font size=\"2\"># gm convert -clip -negate $FILE out\r\n==18510==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x6020000015f4 at pc 0x7f6e936c556b bp 0x7fff17c33ab0 sp 0x7fff17c33aa8\r\nREAD of size 4 at 0x6020000015f4 thread T0\r\n    #0 0x7f6e936c556a in ReadSUNImage \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/coders\/sun.c:581:26\r\n    #1 0x7f6e98fa8e88 in ReadImage \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/magick\/constitute.c:1607:13\r\n    #2 0x7f6e98e3bf18 in ConvertImageCommand \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/magick\/command.c:4348:22\r\n    #3 0x7f6e98e780c5 in MagickCommand \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/magick\/command.c:8869:17\r\n    #4 0x7f6e98f2385b in GMCommandSingle \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/magick\/command.c:17396:10\r\n    #5 0x7f6e98f20991 in GMCommand \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/magick\/command.c:17449:16\r\n    #6 0x7f6e9778b680 in __libc_start_main \/var\/tmp\/portage\/sys-libs\/glibc-2.23-r4\/work\/glibc-2.23\/csu\/..\/csu\/libc-start.c:289\r\n    #7 0x419cd8 in _init (\/usr\/bin\/gm+0x419cd8)\r\n\r\n0x6020000015f4 is located 0 bytes to the right of 4-byte region [0x6020000015f0,0x6020000015f4)\r\nallocated by thread T0 here:\r\n    #0 0x4cf688 in malloc \/var\/tmp\/portage\/sys-libs\/compiler-rt-sanitizers-4.0.1\/work\/compiler-rt-4.0.1.src\/lib\/asan\/asan_malloc_linux.cc:66\r\n    #1 0x7f6e9938a4d6 in MagickMalloc \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/magick\/memory.c:156:10\r\n    #2 0x7f6e98db2590 in AllocateImageColormap \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/magick\/colormap.c:76:21\r\n    #3 0x7f6e936b0f87 in ReadSUNImage \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/coders\/sun.c:428:14\r\n    #4 0x7f6e98fa8e88 in ReadImage \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/magick\/constitute.c:1607:13\r\n    #5 0x7f6e98e3bf18 in ConvertImageCommand \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/magick\/command.c:4348:22\r\n    #6 0x7f6e98e780c5 in MagickCommand \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/magick\/command.c:8869:17\r\n    #7 0x7f6e98f2385b in GMCommandSingle \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/magick\/command.c:17396:10\r\n    #8 0x7f6e98f20991 in GMCommand \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/magick\/command.c:17449:16\r\n    #9 0x7f6e9778b680 in __libc_start_main \/var\/tmp\/portage\/sys-libs\/glibc-2.23-r4\/work\/glibc-2.23\/csu\/..\/csu\/libc-start.c:289\r\n\r\nSUMMARY: AddressSanitizer: heap-buffer-overflow \/var\/tmp\/portage\/media-gfx\/graphicsmagick-1.3.26\/work\/GraphicsMagick-1.3.26\/coders\/sun.c:581:26 in ReadSUNImage\r\nShadow bytes around the buggy address:\r\n  0x0c047fff8260: fa fa 04 fa fa fa 00 00 fa fa 00 00 fa fa fd fd\r\n  0x0c047fff8270: fa fa fd fd fa fa 07 fa fa fa fd fd fa fa 00 01\r\n  0x0c047fff8280: fa fa 00 00 fa fa fd fa fa fa fd fa fa fa 02 fa\r\n  0x0c047fff8290: fa fa 02 fa fa fa 00 fa fa fa 06 fa fa fa 00 fa\r\n  0x0c047fff82a0: fa fa 00 07 fa fa 04 fa fa fa 04 fa fa fa fd fa\r\n=&gt;0x0c047fff82b0: fa fa 00 00 fa fa 00 00 fa fa 04 fa fa fa[04]fa\r\n  0x0c047fff82c0: fa fa fd fa fa fa 00 00 fa fa fa fa fa fa fa fa\r\n  0x0c047fff82d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa\r\n  0x0c047fff82e0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa\r\n  0x0c047fff82f0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa\r\n  0x0c047fff8300: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa\r\nShadow byte legend (one shadow byte represents 8 application bytes):\r\n  Addressable:           00\r\n  Partially addressable: 01 02 03 04 05 06 07 \r\n  Heap left redzone:       fa\r\n  Freed heap region:       fd\r\n  Stack left redzone:      f1\r\n  Stack mid redzone:       f2\r\n  Stack right redzone:     f3\r\n  Stack after return:      f5\r\n  Stack use after scope:   f8\r\n  Global redzone:          f9\r\n  Global init order:       f6\r\n  Poisoned by user:        f7\r\n  Container overflow:      fc\r\n  Array cookie:            ac\r\n  Intra object redzone:    bb\r\n  ASan internal:           fe\r\n  Left alloca redzone:     ca\r\n  Right alloca redzone:    cb\r\n==18510==ABORTING\r\n<\/font><\/pre>\n<p><strong>Affected version:<\/strong><br \/>\n1.3.26<\/p>\n<p><strong>Fixed version:<\/strong><br \/>\nN\/A<\/p>\n<p><strong>Commit fix:<\/strong><br \/>\n<a href=\"http:\/\/hg.code.sf.net\/p\/graphicsmagick\/code\/rev\/95d00d55e978\">http:\/\/hg.code.sf.net\/p\/graphicsmagick\/code\/rev\/95d00d55e978<\/a><\/p>\n<p><strong>Credit:<\/strong><br \/>\nThis bug was discovered by Agostino Sarubbo of Gentoo.<\/p>\n<p><strong>CVE:<\/strong><br \/>\nCVE-2017-12937<\/p>\n<p><strong>Reproducer:<\/strong><br \/>\n<a href=\"https:\/\/github.com\/asarubbo\/poc\/blob\/master\/00304-graphicsmagick-heapoverflow-ReadSUNImage\">https:\/\/github.com\/asarubbo\/poc\/blob\/master\/00304-graphicsmagick-heapoverflow-ReadSUNImage<\/a><\/p>\n<p><strong>Timeline:<\/strong><br \/>\n2017-07-17: bug discovered and reported to upstream<br \/>\n2017-07-31: upstream released a fix<br \/>\n2017-08-05: blog post about the issue<br \/>\n2017-08-18: CVE assigned<\/p>\n<p><strong>Note:<\/strong><br \/>\nThis bug was found with <a href=\"http:\/\/lcamtuf.coredump.cx\/afl\">American Fuzzy Lop<\/a>.<br \/>\nThis bug was identified with bare metal servers donated by <a href=\"https:\/\/www.packet.net\/\">Packet<\/a>. This work is also supported by the <a href=\"https:\/\/www.coreinfrastructure.org\">Core Infrastructure Initiative<\/a>.<\/p>\n<p><strong>Permalink:<\/strong><\/p>\n<blockquote data-secret=\"CQfgHRAz3w\" class=\"wp-embedded-content\"><p><a href=\"http:\/\/blogs.gentoo.org\/ago\/2017\/08\/05\/graphicsmagick-heap-based-buffer-overflow-in-readsunimage-sun-c\/\">graphicsmagick: heap-based buffer overflow in ReadSUNImage (sun.c)<\/a><\/p><\/blockquote>\n<p><iframe class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; clip: rect(1px, 1px, 1px, 1px);\" src=\"http:\/\/blogs.gentoo.org\/ago\/2017\/08\/05\/graphicsmagick-heap-based-buffer-overflow-in-readsunimage-sun-c\/embed\/#?secret=CQfgHRAz3w\" data-secret=\"CQfgHRAz3w\" width=\"600\" height=\"338\" title=\"&#8220;graphicsmagick: heap-based buffer overflow in ReadSUNImage (sun.c)&#8221; &#8212; agostino&#039;s blog\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Description: graphicsmagick is a collection of tools and libraries for many image formats. The complete ASan output of the issue: # gm convert -clip -negate $FILE out ==18510==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x6020000015f4 at pc 0x7f6e936c556b bp 0x7fff17c33ab0 sp 0x7fff17c33aa8 &hellip; <a href=\"https:\/\/blogs.gentoo.org\/ago\/2017\/08\/05\/graphicsmagick-heap-based-buffer-overflow-in-readsunimage-sun-c\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":140,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false,"jetpack_publicize_feature_enabled":true},"categories":[12,10],"tags":[],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p2EaBc-vr","_links":{"self":[{"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/1949"}],"collection":[{"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/users\/140"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/comments?post=1949"}],"version-history":[{"count":5,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/1949\/revisions"}],"predecessor-version":[{"id":2056,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/posts\/1949\/revisions\/2056"}],"wp:attachment":[{"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/media?parent=1949"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/categories?post=1949"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.gentoo.org\/ago\/wp-json\/wp\/v2\/tags?post=1949"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}